==Unang Distrito==
*'''[[Mga_lungsod_ng_PilipinasMga |lungsod ng Pilipinas|Lungsod]]''': [[Malolos]]
*'''[[Mga_bayan_ng_PilipinasMga munisipalidad ng Pilipinas|BayanMunisipalidad]]''': [[Bulakan]], [[Calumpit]], [[Hagonoy, Bulacan|Hagonoy]], [[Paombong]], [[Pulilan]]
*'''Populasyon (20072015)''': 658717,222820
{| class="wikitable" width=40%
|-
!width=40%|PeriodPanahon
!Kinatawan
!Representative
|-
|<center><small>[[1stIkawalong PhilippineKongreso Legislatureng Pilipinas|Ikawalong Kongreso]]</small><br>19071987–19091992
|<center>AguedoFrancisco VelardeB. Aniag Jr.
|-
|<center><small>[[2ndIkasiyam Philippinena LegislatureKongreso ng Pilipinas|Ikasiyam na Kongreso]]</small><br>19091992–19121995
|rowspan=2|<center>HermogenesTeodulo ReyesC. Natividad
|-
|<center><small>[[3rdIkasampung PhilippineKongreso Legislatureng Pilipinas|Ikasampung Kongreso]]</small><br>19121995–19161998
|<center>Ambrosio Santos
|-
|<center><small>[[4thIka-11 Philippinena LegislatureKongreso ng Pilipinas|Ika-11 na Kongreso]]</small><br>19161998–19192001
|rowspan=3|<center> [[Wilhelmino Sy-Alvarado|Wilhelmino M. Sy-Alvarado ]]▼
|<center>Mariano Escueta
|-
|<center><small>[[5thIka-12 Philippinena LegislatureKongreso ng Pilipinas|Ika-12 na Kongreso]]</small><br>19192001–19222004
|rowspan=3|<center>Jose Padilla ▼
|-
|<center><small>[[6thIka-13 Philippinena LegislatureKongreso ng Pilipinas|Ika-13 na Kongreso]]</small><br>19222004–19252007
|-
|<center><small>[[7th Philippine Legislature]]</small><br>1925–1928
|-
|<center><small>[[8th Philippine Legislature]]</small><br>1928–1931
|<center>Angel Suntay
|-
|<center><small>[[9th Philippine Legislature]]</small><br>1931–1934
|rowspan=2|<center>[[Francisco Afan Delgado]]
|-
|<center><small>[[10th Philippine Legislature]]</small><br>1934–1935
|-
|<center><small>[[1st National Assembly of the Philippines|1st National Assembly]]</small><br>1935–1938
|rowspan=2|<center>[[Nicolas Buendia]]
|-
|<center><small>[[2nd National Assembly of the Philippines|2nd National Assembly]]</small><br>1938–1941
|-
|<center><small>[[3rd National Assembly of the Philippines|3rd National Assembly]]</small><br>1941–1946
|<center>Leon Valencia
|-
|<center><small>[[1st Congress of the Philippines|1st Congress]]</small><br>1946–1949
|rowspan=2|<center>Florante C. Roque
|-
|<center><small>[[2nd Congress of the Philippines|2nd Congress]]</small><br>1949–1953
|-
|<center><small>[[3rd Congress of the Philippines|3rd Congress]]</small><br>1953–1957
|<center>Erasmo R. Cruz
|-
|<center><small>[[4th Congress of the Philippines|4th Congress]]</small><br>1957–1961
|<center>Jose Suntay
|-
|<center><small>[[5th Congress of the Philippines|5th Congress]]</small><br>1961–1965
|rowspan=3|<center>Teodulo C. Natividad
|-
|<center><small>[[6th Congress of the Philippines|6th Congress]]</small><br>1965–1969
|-
|<center><small>[[7th Congress of the Philippines|7th Congress]]</small><br>1969–1972
|-
|<center><small>[[8th Congress of the Philippines|8th Congress]]</small><br>1987–1992
|<center>Francisco B. Aniag, Jr.
|-
|<center><small>[[9th Congress of the Philippines|9th Congress]]</small><br>1992–1995
|rowspan=2|<center>Teodulo C. Natividad
|-
|<center><small>[[10thIka-14 Congressna ofKongreso theng PhilippinesPilipinas|10thIka-14 Congressna Kongreso]]</small><br>19952007–19982010
|rowspan=3|<center>[[Ma. Victoria Sy-Alvarado|Ma. Victoria R. Sy-Alvarado]] ▼
|-
|<center><small>[[11thIka-15 Congressna ofKongreso theng PhilippinesPilipinas|11thIka-15 Congressna Kongreso]]</small><br>19982010–20012013
▲|rowspan=3|<center>Wilhelmino M. Sy-Alvarado
|-
|<center><small>[[12thIka-16 Congressna ofKongreso theng PhilippinesPilipinas|12thIka-16 Congressna Kongreso]]</small><br>20012013–20042016
|-
|<center><small>[[13thIka-17 Congressna ofKongreso theng PhilippinesPilipinas|13thIka-17 Congressna Kongreso]]</small><br>20042016–20072019
▲|rowspan= 32|<center>Jose PadillaAntonio R. Sy-Alvarado
|-
|<center><small>[[14thIka-18 Congressna ofKongreso theng PhilippinesPilipinas|14thIka-18 Congressna Kongreso]]</small><br>20072019–20102022
▲|<center>[[Ma. Victoria Sy-Alvarado|Ma. Victoria R. Sy-Alvarado]]
|}
|